CdS Micrometer Hollow Spheres for Detecting Alcohols Except Methanol with Strong Anti-interference Ability

Area of Science:

• Materials Science
• Chemical Sensing
• Nanotechnology

Background:

• Volatile organic compounds (VOCs) detection is crucial for environmental monitoring and industrial safety.
• Development of sensitive and selective gas sensors is an active area of research.
• Cadmium sulfide (CdS) is a semiconductor material with potential applications in gas sensing.

Purpose of the Study:

• To fabricate cadmium sulfide micrometer hollow spheres (CdS MHs) using a hydrothermal method.
• To evaluate the performance of CdS MHs as a sensor for detecting various volatile organic compounds (VOCs), particularly alcohols.
• To assess the anti-interference capabilities and optimal working conditions of the CdS MHs sensor.

Main Methods:

• Hydrothermal synthesis was employed to fabricate CdS micrometer hollow spheres (CdS MHs).
• The gas sensing performance of CdS MHs was tested against a range of VOCs, including alcohols (methanol, ethanol, propanol, butanol, amyl alcohol), acetone, and xylene.
• Sensor response, optimal working temperature, and interference effects were systematically investigated.

Main Results:

• The optimal working temperature for the CdS MHs sensor was determined to be 190 °C.
• The sensor demonstrated significant responses to ethanol (27.4-100 ppm) and isopropanol (84.55-100 ppm).
• The CdS MHs sensor exhibited strong anti-interference abilities against methanol and acetone, with minimal relative deviations observed in mixed gas detection.

Conclusions:

• Cadmium sulfide micrometer hollow spheres are effective materials for alcohol detection.
• The CdS MHs sensor shows good response and selectivity, making it suitable for detecting alcohols (excluding methanol).
• The developed sensor is a promising candidate for practical applications in alcohol monitoring and detection systems.